Calculation:
Have student highlight math symbols before computing
Use mainpulatives
Use graph paper
Use a number line
Have 0-100 taped on desk
Use calculator to check problems
Portion worksheets
Fold worksheets to allow a few problems at a time
Use Touch Math
Sorten assignments
Stress quality rather than quantity

Math reasoning:
Draw pictures to represent the problem
Use manipulatives
Break down problems into steps
Use an easier word problem that would require the same computational steps
Reduce amount of problems